diff --git a/Makefile b/Makefile
index 0cfb65e80..5bc0e8a3c 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ LIBS = libs2ss.so
 
 # Object files for libs2ss
 LIB_OBJS = sample.o path.o node.o \
-	   linux.o \
+	   kernel.o \
 	   list.o pool.o queue.o lstack.o \
 	   log.o \
 	   utils.o \
diff --git a/include/linux.h b/include/kernel.h
similarity index 88%
rename from include/linux.h
rename to include/kernel.h
index ec51aef65..08ca042ae 100644
--- a/include/linux.h
+++ b/include/kernel.h
@@ -10,6 +10,15 @@
 #ifndef _LINUX_H_
 #define _LINUX_H_
 
+//#include <sys/capability.h>
+
+/** Check if current process has capability \p cap.
+ *
+ * @retval 0 If capabilty is present.
+ * @retval <0 If capability is not present.
+ */
+//int kernel_check_cap(cap_value_t cap):
+
 /** Checks for realtime (PREEMPT_RT) patched kernel.
  *
  * See https://rt.wiki.kernel.org
diff --git a/lib/gtfpga.c b/lib/gtfpga.c
index c9dc4d647..7e07921d2 100644
--- a/lib/gtfpga.c
+++ b/lib/gtfpga.c
@@ -17,7 +17,7 @@
 #include "utils.h"
 #include "timing.h"
 #include "utils.h"
-#include "linux.h"
+#include "kernel.h"
 
 static struct pci_access *pacc;
 
diff --git a/lib/if.c b/lib/if.c
index b86d8a767..6b417e24c 100644
--- a/lib/if.c
+++ b/lib/if.c
@@ -21,7 +21,7 @@
 #include "nl.h"
 #include "socket.h"
 #include "utils.h"
-#include "linux.h"
+#include "kernel.h"
 
 struct interface * if_create(struct rtnl_link *link)
 {
diff --git a/lib/linux.c b/lib/kernel.c
similarity index 82%
rename from lib/linux.c
rename to lib/kernel.c
index 0dd13377f..b2ff8c396 100644
--- a/lib/linux.c
+++ b/lib/kernel.c
@@ -20,7 +20,7 @@
 
 #include "utils.h"
 #include "config.h"
-#include "linux.h"
+#include "kernel.h"
 
 int kernel_module_set_param(const char *module, const char *param, const char *value)
 {
@@ -30,7 +30,7 @@ int kernel_module_set_param(const char *module, const char *param, const char *v
 	snprintf(fn, sizeof(fn), "%s/module/%s/parameters/%s", SYSFS_PATH, module, param);
 	f = fopen(fn, "w");
 	if (f) {
-		debug(5, "Set parameter %s of kernel module %s to %s", module, param, value);
+		debug(DBG_SOCKET | 5, "Set parameter %s of kernel module %s to %s", module, param, value);
 		fprintf(f, "%s", value);
 		fclose(f);
 	}
@@ -121,6 +121,8 @@ int kernel_has_cmdline(const char *substr)
 
 	if (!fgets(cmd, sizeof(cmd), f))
 		return -1;
+	
+	fclose(f);
 
 	return strstr(cmd, substr) ? 0 : -1;
 }
@@ -128,4 +130,32 @@ int kernel_has_cmdline(const char *substr)
 int kernel_get_cacheline_size()
 {
 	return sysconf(_SC_LEVEL1_ICACHE_LINESIZE);
-}
\ No newline at end of file
+}
+
+#if 0
+int kernel_check_cap(cap_value_t cap)
+{
+	int ret;
+
+	cap_t caps;
+	cap_flag_value_t value;
+	
+	caps = cap_get_proc();
+	if (caps == NULL)
+		return -1;
+
+	ret = cap_get_proc(caps);
+	if (ret == -1)
+		return -1;
+	
+	ret = cap_get_flag(caps, cap, CAP_EFFECTIVE, &value);
+	if (ret == -1)
+		return -1;
+	
+	ret = cap_free(caps);	
+	if (ret)
+		return -1;
+	
+	return value == CAP_SET ? 0 : -1;
+}
+#endif
\ No newline at end of file
diff --git a/lib/pool.c b/lib/pool.c
index 5298555d1..fbcf2c084 100644
--- a/lib/pool.c
+++ b/lib/pool.c
@@ -11,7 +11,7 @@
 #include "utils.h"
 
 #include "pool.h"
-#include "linux.h"
+#include "kernel.h"
 
 int pool_init_mmap(struct pool *p, size_t blocksz, size_t cnt)
 {